Gestra DK57 is a thermodynamic steam trap designed for steam and condensate systems. It features an AISI 420 body and disc, supports NPT and BSP threaded connections, is available in DN10 to DN25 sizes, and has a maximum operating pressure of 42 bar g and a maximum allowable temperature of 400 °C. It is primarily used for condensate drainage in steam system lines under high-temperature and high-pressure conditions, separating steam from condensate.
Gestra thermodynamic steam trap DK57, 3/4-inch angle product image
1 / 1
DK57 Thermodynamic Steam Trap | Gestra
Thermodynamic steam trap with AISI 420 body, NPT/BSP threads, DN10-DN25.
Genuine product assurance
We can help verify product data and purchasing details.
Model confirmation
Confirm model, connection and key options before ordering.
After-sales support
After-sales communication support is provided according to the order agreement.
Specifications
- Steam trap type
- Thermodynamic
- Applicable media
- Steam and condensate
- Maximum operating pressure
- 42 bar g
- Maximum allowable temperature
- 400 °C
- Maximum allowable back pressure
- 80% of upstream pressure
- Connection type
- NPT and BSP (ISO 228/1) threaded connections
- Connection sizes
- DN10, DN15, DN20, DN25
- Body material
- AISI 420 / DIN 1.4021
- Cover material
- AISI 416 / DIN 1.4005
- Disc material
- AISI 420 / DIN 1.4021
Application scenarios
Condensate drainage in steam system lines
Used to separate and discharge steam and condensate in steam system lines, and suitable for high-temperature and high-pressure conditions. DK57 is a thermodynamic steam trap for steam and condensate, with a maximum operating pressure of 42 bar g, a maximum allowable temperature of 400 °C, threaded connections, and sizes from DN10 to DN25.
Installation & maintenance notes
Back pressure ratio limitation
During system design and commissioning, ensure that the maximum allowable back pressure does not exceed 80% of the upstream pressure.
FAQ
What steam system conditions is the Gestra DK57 thermodynamic steam trap suitable for?
Valve Cloud Warehouse recommends the Gestra DK57 for condensate drainage from pipelines and steam-water separation in steam and condensate systems, particularly in high-temperature and high-pressure applications. Its maximum operating pressure is 42 bar g, and its maximum allowable temperature is 400 °C. During actual selection, the system operating pressure and temperature must not exceed the applicable limits.
How should the DK57 L or H type be selected according to the condensate load?
The DK57 L type is intended for lower condensate flow rates, while the DK57 H type is intended for higher condensate flow rates. In addition to distinguishing between the L and H types, engineering selection should consider the steam or operating pressure, back pressure, condensate quantity to be discharged, installation location, and specific application conditions. The maximum hot condensate discharge capacity should also be verified against the DK57 capacity chart.
What is the allowable back-pressure range of the DK57, and why is it important during selection?
The maximum allowable back pressure of the DK57 is 80% of the upstream pressure. Back pressure affects the available differential pressure across the steam trap and its condensate discharge capacity. Therefore, in steam main lines, condensate return headers, or other systems where back pressure may develop, the ratio of the actual back pressure to the upstream pressure must be included in the selection calculation.
What connection sizes and thread standards are available for the Gestra DK57?
The DK57 uses NPT or BSP (ISO 228/1) threaded connections and is available in DN10, DN15, DN20, and DN25, corresponding to 3/8 inch, 1/2 inch, 3/4 inch, and 1 inch connections, respectively. Valve Cloud Warehouse recommends specifying the required nominal size and NPT or BSP thread standard when purchasing to prevent incompatibility with the site piping connections.
What materials are used for the main components of the DK57?
The DK57 body and disc are made of AISI 420 and DIN 1.4021 materials, while the cover is made of AISI 416 and DIN 1.4005 materials. Selection personnel can use this information to verify project requirements for the body, cover, and disc materials, and should confirm suitability based on the system media, namely steam and condensate, as well as the actual pressure and temperature conditions.